Can't say for sure but every other PCV valve I ever saw had the big **** end stuck into a grommet in a valve cover and the little nozzle end stuck into a rather fat vacuum line. So what I would do is just confine my search to the valve covers and once found, I would also pull out the dry cracked old grommet and pull off the dry old cracked vacuum line and take them to an advance or autozone and have the helpful salesperson get me replacements for those also. All told your parts should be under 10 bucks and even if the PCV was not bad you have accidentally fixed some leaking vacuum.

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very nice pictoral of where things are located on the corolla .for some reason the PCV valve does not seem to be listed but everything else is ...nice for general maritainence .. http://www.corolland.com/repairs.html

You'll find the PCV valve
on the right side of the front valve cover. You'll need to remove the
valve in order to troubleshoot it to determine if you need a
replacement. To remove, pull the PCV valve out of the cover and detach
the hose

Test
the old PCV valve to determine if it needs replacing. Blow air through
it in order to see if it is clogged. If it does not seem to ventilate,
then you'll need to install a new valve.

Pop
the new PCV valve into the spot of the old valve. With the correct
part, it should snap right in. Take the hose and reattach it in order
to complete the installation.

**if the Eng 4 cylinder they are located under the coil bord which is on the top of the Eng tide with 4 bolt 13mm
*** if 6 cylinder they located under neath the valve cover or u can follow the spark plugs wire

the pcv valve will be sticking out of the valve cover in either the front or back. and as for the dexcol, i would have it flushed really well and replaced with the reg green coolant. ive seen that stuff get bad quick.